button{
	width: 200px;
	height: 200px;
	border-radius: 50%;
}

button:hover{
	border-radius: 0;
	transition-property: width;
	transition-duration: 0.5s;
	transition-delay:0.2s;
	transition-timing-function: ease-in;
}

button:click{
	border-radius: 50%;
	transition-property: width;
	transition-duration: 0.5s;
	transition-delay:0.2s;
	transition-timing-function: ease-out;
}
